CN111393956B - Water-based two-component conversion type rusty anticorrosive paint and preparation thereof - Google Patents

Water-based two-component conversion type rusty anticorrosive paint and preparation thereof Download PDF

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CN111393956B
CN111393956B CN202010241159.8A CN202010241159A CN111393956B CN 111393956 B CN111393956 B CN 111393956B CN 202010241159 A CN202010241159 A CN 202010241159A CN 111393956 B CN111393956 B CN 111393956B
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rust
acid
anticorrosive paint
parts
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CN111393956A (en
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姬振行
王少华
张海凤
王宇川
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Cetc Baoli Beijing Technology Co ltd
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Cetc Baoli Beijing Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • C09D163/10—Epoxy resins modified by unsaturated compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/14—Polycondensates modified by chemical after-treatment
    • C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
    • C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
    • C08G59/1455—Monocarboxylic acids, anhydrides, halides, or low-molecular-weight esters thereof
    • C08G59/1461—Unsaturated monoacids
    • C08G59/1466—Acrylic or methacrylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/329—Phosphorus containing acids

Abstract

The water-based two-component conversion type on-rust anticorrosive paint is prepared from a component A and a component B, wherein the component A comprises the following components: the component B comprises an aliphatic amine curing agent; the rust conversion agent is a compound of phosphoric acid and gallic acid modified by esterification of polyol monoether. According to the water-based two-component conversion type rusty anticorrosive paint provided by the invention, the organic acid capable of being compounded with the phosphoric acid is obtained by esterifying and modifying the gallic acid by using the polyol ether, an inorganic acid-organic acid compound system formed by compounding the organic acid-organic acid compound paint with the phosphoric acid has excellent rust conversion time and rust conversion capability, and an inert protective layer formed by the inorganic acid-organic acid compound and a rust layer is tough and not easy to be brittle. According to the invention, the film-forming high molecular substance acrylic acid derivative is subjected to epoxy modification, and the finally prepared film-forming emulsion has good adhesive force and corrosion resistance after film forming.

Description

Water-based two-component conversion type rusty anticorrosive paint and preparation thereof
Technical Field
The invention belongs to the technical field of metal anticorrosive coatings, and particularly relates to a water-based two-component conversion type rusty anticorrosive coating and a preparation method thereof.
Background
The rusty paint is a kind of antirust paint which can be directly coated on the surface of steel material with a certain rust and still can play a role of corrosion inhibition, also called rusty surface paint and rusty coating. When it is coated on the surface of metal with residual rust, it can make rust stable, passivated or converted, and make active rust become harmless substance so as to attain the double-function of protecting rust-proof box.
Rusty paints appeared in germany for the first thirty decades of the twentieth century, and then more intensive research was conducted in japan and some countries in the west. In the early 90 s of the last century, at least more than twenty companies in the countries of America, English and the like have developed successful and commercialized rusty paint products. China is a research on rusty coatings from the end of the last 60 th century, the research is greatly advanced at the end of the 70 th century, the composition, type and performance of products are greatly expanded and perfected, detection means and action mechanism of the rusty coatings are systematically researched, the application range is continuously expanded, and the rusty coatings are widely and successfully applied to the industries of vehicles, ships, buildings, metallurgy, chemical engineering, pipelines, bridges and various steel machines at present, so that the construction period is greatly shortened, the labor condition is improved, the engineering cost is reduced, and remarkable economic benefit and social effect are achieved.
The rusty paint mainly comprises an organic film forming substance, a rust converting agent or a rust stabilizing agent, a solvent, an auxiliary agent, other auxiliary materials and the like. The existing widely used rusty coatings can be divided into three categories according to the effect of the rust-converting anticorrosive coating on a rust layer: stable, permeable, and transformed. Because the stable and permeable rusty paint can not convert the rust and only can play a role of sealing the rust, if the residual moisture in the rust or the barrier property of a paint film to water vapor and oxygen is not ideal, the paint film can not be ensured to have lasting protective property, so that the conversion rusty paint is widely popularized at present. The conversion type rusty paint contains ordinary components and also contains a rust conversion substance which can convert rust into a complex or chelate which is harmless or has a certain protection effect, and the rust conversion substance is adhered and sealed by a high-molecular film forming substance of the paint, isolated from the outside and fixed in a coating film to play a role of an antirust pigment, so that a firm coating film with an anticorrosion effect is generated and is adhered to the surface of steel to play a role of protecting a base material. The conversion effect commonly used in the current rusty paint is better in a phosphoric acid-tannic acid system, and phosphoric acid can react with rust to generate Fe2+、Fe3+Metal ion Fe2+、Fe3Reacting with tannic acid added into the paint to convert into insoluble, harmless and ferric tannate complex salt with certain protection effect, the disclosed prior art has patent CN201410165201.7, wherein an aqueous rusty antirust paint and a preparation method thereof are disclosed, a converting agent is a mixture of any two of salicylic acid, gallic acid, tea polyphenol, tannic acid, ascorbic acid and oxalic acid; the film forming matter comprises styrene-acrylic emulsion, water-soluble epoxy resin and water-soluble acrylic resin; the thickening agent is any one of polyacrylate, hydroxymethyl cellulose, alginate and agar. CN201810550178.1 publicAn environment-friendly steel surface rust-conversion anticorrosive paint and a preparation method thereof are provided, and the paint mainly comprises the following components: rust converting agent mainly comprising tannic acid and phosphoric acid and film forming material mainly comprising epoxy resin modified styrene-acrylic emulsion. Although the anticorrosive paint disclosed in the above patent has excellent physicochemical rust prevention and rust conversion functions, phosphoric acid has a hydrogen evolution effect, and tannic acid has a problem of brittleness of a film, which easily causes problems of early local foaming, collapse and peeling of the film layer, and seriously affects the anticorrosive function of the anticorrosive paint. Therefore, the research and development of the rust conversion substance play a decisive role in the performance, application and popularization of the water-based rusty paint.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a water-based two-component conversion type rusty anticorrosive paint and a preparation method thereof. According to the aqueous two-component conversion type rusty anticorrosive paint provided by the invention, the organic acid capable of being compounded with the phosphoric acid is obtained by esterifying and modifying the gallic acid by using the polyalcohol monoether, an inert protective layer formed by the inorganic acid-organic acid compound system is tough and not easy to be brittle, the problems of early local foaming, collapse and falling of a film layer are avoided, and the anticorrosive paint prepared by matching with the epoxy modified acrylic emulsion has a good anticorrosive effect.
In order to achieve the purpose, the invention adopts the specific technical scheme that:
the water-based two-component conversion type rusty anticorrosive paint is prepared from a component A and a component B, wherein the component A comprises: the component B comprises an aliphatic amine curing agent; the rust conversion agent is a compound of phosphoric acid and gallic acid modified by esterification of polyol monoether.
The component A comprises the following raw materials in parts by weight: 10-20 parts of rust conversion agent, 40-60 parts of film forming emulsion and 1-3 parts of thickening agent, wherein the component B comprises 5-20 parts of aliphatic amine curing agent.
The rust conversion agent is a compound of phosphoric acid and gallic acid modified by polyalcohol monoether according to the weight ratio of 1:1-3, wherein the gallic acid modified by esterification of the polyalcohol monoether is prepared by the polyalcohol monoether and the gallic acid according to the weight ratio of 0.9-1.2: 1.
The polyalcohol monoether is at least one selected from ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, propylene glycol monophenyl ether, triethylene glycol monomethyl ether, butyl tetraol monomethyl ether and butyl tetraol monoethyl ether.
The method of the alcohol ether modified gallic acid is a conventional alcohol acid esterification method, the catalyst of the alcohol acid esterification method is concentrated sulfuric acid, and the reaction temperature is 80-100 ℃.
The film-forming emulsion is prepared from epoxy modified acrylate, wherein the modified acrylate is obtained by polymerizing the following monomers: bisphenol a epoxy resins, acrylic acid derivatives; preferably, 100 parts of bisphenol A epoxy resin and 10-20 parts of acrylic acid derivative.
The epoxy value of the bisphenol A epoxy resin is 0.2-0.6mol/100g, and preferably at least one of E-20, E-44, E-51, E-54 and E-56 epoxy resins.
The acrylic acid derivative is selected from (meth) acrylic acid, alkyl (meth) acrylate and (meth) acrylamide, and preferably, the acrylic acid derivative is selected from at least one of methyl acrylate, butyl methacrylate, methyl 2-methacrylate, tert-butyl acrylate, hydroxypropyl acrylate, acrylic acid, methacrylic acid and 2-methacrylamide.
The preparation method of the film-forming emulsion comprises the following steps:
1) dissolving bisphenol A epoxy resin in an organic solvent, introducing inert gas, adding an initiator accounting for 0.1-1% of the mass of monomers contained in the modified acrylate, heating to 80-110 ℃, and keeping the constant temperature;
2) gradually dripping acrylic acid derivatives into the mixed system, and reacting at constant temperature;
3) cooling the final mixed system in the step 2), adding a pH regulator to regulate the pH to be neutral, adding deionized water, and stirring uniformly to obtain the film-forming emulsion.
The initiator in the step 1) is at least one of azo initiator or peroxy compound initiator; the organic solvent is not particularly required, and may be capable of dissolving the monomer, including but not limited to n-butanol, ethylene glycol butyl ether; the modified acrylate is obtained by polymerizing monomers including: bisphenol A epoxy resin and acrylic acid derivatives.
And 3) the pH regulator is ammonia water.
The anticorrosive coating may further include adjuvants including, but not limited to, at least one of thickeners, defoamers, pigments, preservatives, and film forming aids.
The thickener comprises at least one of xanthan gum, methyl hydroxypropyl cellulose, methyl cellulose and hydroxyethyl cellulose.
The defoaming agent comprises at least one of a silicone defoaming agent and a polyether defoaming agent.
The pigment comprises at least one of iron oxide red, titanium dioxide and iron oxide yellow.
The preservative comprises at least one of p-methyl phenol, o-chlorophenol, o-methyl phenol and 2-chlorohydroquinone.
The film forming assistant comprises alcohols, alcohol esters and alcohol ethers, and is specifically selected from at least one of isopropanol, dodecyl alcohol ester, ethylene glycol butyl ether and propylene glycol methyl ether.
A preparation method of a water-based two-component conversion type rusty anticorrosive paint comprises the following steps:
t1: heating phosphoric acid;
t2: adding the gallic acid modified by the polyalcohol monoether into the mixture obtained in the step, and stirring until the gallic acid is completely dissolved;
t3: adding the film-forming emulsion into the mixture obtained in the step under the stirring condition;
t4: adding a thickening agent into the mixture obtained in the step, adjusting the viscosity to obtain an anticorrosive paint component A, discharging and storing;
t5: weighing aliphatic amine curing agent in another container to obtain component B of the anticorrosive paint, discharging and storing;
t6: uniformly mixing the component A and the component B of the anticorrosive paint obtained in the step for later use; and/or
The heating temperature of the step T1 is 30-40 ℃; and/or
In the step T4, the viscosity of the component A is 400-500mpa.s, and the solid content is 40-55%; and/or
And step T6, uniformly mixing the component A and the component B according to the weight ratio of 0.8-1.2: 1.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a water-based two-component conversion type rusty anticorrosive paint, which is characterized in that organic acid capable of being compounded with phosphoric acid is obtained by esterifying gallic acid with polyol ether, an inorganic acid-organic acid compound system formed by compounding with the phosphoric acid has proper rust conversion time and excellent rust conversion capability, and an inert protective layer formed by the inorganic acid-organic acid compound and a rust layer is tough and not easy to be brittle.
The preparation method comprises the step of carrying out epoxy modification on the film-forming high molecular substance acrylic acid derivative to finally prepare the film-forming emulsion which has good adhesive force and corrosion resistance after film forming.
The preparation method is simple, environment-friendly and pollution-free, and the finally prepared water-based anticorrosive paint is an energy-saving, consumption-reducing and environment-friendly product.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the descriptions in the following. Unless otherwise specified, "parts" in the examples of the present invention are parts by weight. All reagents used are commercially available in the art.
Example 1
Preparing rust conversion agent-propylene glycol monobutyl ether modified gallic acid:
9 parts of propylene glycol monobutyl ether, 10 parts of gallic acid and 0.57 part of concentrated sulfuric acid (98%) are sequentially added into a reaction vessel containing 22.5 parts of acetone and 7.5 parts of deionized water, and the mixture is stirred and heated to 80 ℃ under reflux. And after the reaction is finished, adding 50 parts of deionized water, separating to obtain a reaction solution, adding 50 parts of chloroform for extraction, and carrying out reduced pressure distillation to obtain the liquid propylene glycol monobutyl ether modified gallic acid.
Preparation of film-forming emulsion-modified acrylate emulsion:
1) dissolving 100 parts of bisphenol A type epoxy resin E-44 in ethylene glycol monobutyl ether, and introducing N2Adding 1.1 parts of BPO, heating to 90 ℃, and keeping constant temperature;
2) gradually dripping 10 parts of methacrylic acid into the mixed system, and reacting for 5 hours at constant temperature;
3) and (3) cooling the final mixed system obtained in the step 2) to room temperature of 23 ℃, adding ammonia water to adjust the pH value to 7, adding 60 parts of deionized water, and stirring uniformly to obtain the film-forming emulsion.
The preparation of the aqueous two-component conversion type rusty anticorrosive paint comprises the following steps:
t1: heating 20 parts of deionized water to 35 ℃, and slowly pouring 5 parts of phosphoric acid;
t2: adding 15 parts of propylene glycol monobutyl ether modified gallic acid prepared in advance into the mixture obtained in the step, and stirring until the gallic acid is completely dissolved;
t3: adding 5 parts of an organic silicon defoamer SN154, 15 parts of iron oxide red, 2 parts of preservative o-chlorophenol and 2 parts of film-forming aid dodecyl alcohol ester into the mixture obtained in the step, and stirring the mixture uniformly;
t4: adding 40 parts of the prepared film-forming emulsion into the mixture obtained in the step under the stirring condition;
t5: adding 3 parts of thickening agent xanthan gum and 1 part of isopropanol into the mixture obtained in the step, adjusting the viscosity to 450mpa.s, adding water to adjust the solid content to 40.2% to obtain an anticorrosive coating A component, discharging and storing;
t6: mixing 15 parts of hexamethylenediamine and 20 parts of deionized water in another container until the mixture is uniform to obtain a component B of the anticorrosive coating, discharging and storing;
t7: and (3) uniformly mixing the component A and the component B of the anticorrosive paint obtained in the step (1: 1) in a weight ratio for later use.
Example 2
The rest of the process is the same as that in example 1, except that the amount of the phosphoric acid used in the preparation process of the aqueous two-component conversion type rust-carrying anticorrosive paint is 10 parts, and the amount of the propylene glycol monobutyl ether-modified gallic acid used in the preparation process is 10 parts.
Example 3
The rest of the process is the same as that of example 1, except that the amount of phosphoric acid used in the preparation of the aqueous two-component conversion-type rust-bearing anticorrosive paint is 3.33 parts, and the amount of propylene glycol monobutyl ether-modified gallic acid used in the preparation of the aqueous two-component conversion-type rust-bearing anticorrosive paint is 16.67 parts.
Example 4
The rest of the process was the same as in example 1, except that 13.33 parts of phosphoric acid and 6.67 parts of propylene glycol monobutyl ether-modified gallic acid were used in the preparation of the aqueous two-component conversion-type rust-bearing anticorrosive paint.
Example 5
The rest of the process is the same as that in example 1, except that the amount of phosphoric acid used in the preparation process of the aqueous two-component conversion type rust-carrying anticorrosive paint is 2.5 parts, and the amount of the propylene glycol monobutyl ether-modified gallic acid used in the preparation process is 7.5 parts.
Example 6
The rest of the process is the same as that in example 1, except that the amount of the phosphoric acid used in the preparation process of the aqueous two-component conversion type rust-carrying anticorrosive paint is 2 parts, and the amount of the propylene glycol monobutyl ether-modified gallic acid used in the preparation process is 6 parts.
Example 7
The rest of the process is the same as that in example 1, except that the amount of phosphoric acid used in the preparation process of the aqueous two-component conversion type rust-carrying anticorrosive paint is 6.25 parts, and the amount of the propylene glycol monobutyl ether-modified gallic acid used in the preparation process is 18.75 parts.
Example 8
The rest of the process is the same as example 1, except that the amount of the propylene glycol monobutyl ether used in the preparation of the gallic acid modified by the propylene glycol monobutyl ether is 12 parts, and the amount of the gallic acid used in the preparation is 10 parts.
Example 9
The rest of the process is the same as that of example 1, except that the amount of the film-forming emulsion used in the preparation process of the aqueous two-component conversion type rust-carrying anticorrosive paint is 60 parts.
Example 10
The procedure was as in example 1, except that the amount of the methacrylic acid monomer used in the preparation of the film-forming emulsion-modified acrylate emulsion was 20 parts.
Comparative example 1
The rest of the process is the same as that in example 1, except that the gallic acid modified by propylene glycol monobutyl ether is replaced by the same amount of tannic acid in the preparation process of the aqueous two-component conversion type rust-carrying anticorrosive paint.
The anticorrosive coatings prepared in the examples or the comparative examples are uniformly mixed, directly coated on a rusted steel plate at 25 ℃ by adopting a spraying method or a brush coating method, and cured to obtain a flat, smooth, compact and uniform paint film, and the paint film is subjected to the following performance tests, and the results are shown in table 1.
Flexibility: paint film flexibility measurements were carried out with reference to the standard GB 1731-1993-T.
Adhesion force: the test was carried out with reference to the standard GB/T9286-1998.
Initial water resistance of the coating: and (3) drying the paint film of the prepared rusted paint for 12 hours at normal temperature, then carrying out a dripping experiment on the paint film, and observing whether the paint film has the conditions of color change, foaming, collapse, shedding and rusting within 24 hours.
Rust conversion time: the time required for complete blackening was visually observed.
Degree of rust conversion: the area of color change of the metal matrix was observed visually after peeling.
Acid resistance: the test is carried out according to the standard GB/T9274-88, the test condition is 0.05mol/L sulfuric acid, and the soaking is carried out for 24 hours.
Alkali resistance: the test is carried out according to the standard GB/T9274-88, the test condition is 0.1mol/L sodium hydroxide, and the soaking time is 24 hours.
TABLE 1
Figure BDA0002432613920000061
Figure BDA0002432613920000071
The aqueous two-component conversion type rusty anticorrosive paint provided by the invention is characterized in that a rust conversion agent capable of being compounded with phosphoric acid is obtained by esterifying gallic acid with polyol ether, an inorganic acid-organic acid compound system formed by compounding with phosphoric acid has excellent rust conversion time and rust conversion capability, and an inert protective layer formed by the inorganic acid-organic acid compound and a rust layer is tough and not easy to be brittle.
According to the preparation method, the film-forming high-molecular substance acrylic acid derivative is subjected to epoxy modification, and finally the film-forming emulsion prepared has good adhesive force and corrosion resistance after film forming.
The preparation method is simple, environment-friendly and pollution-free, and the finally prepared water-based anticorrosive paint is an energy-saving, consumption-reducing and environment-friendly product.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.

Claims (8)

1. The water-based two-component conversion type rusty anticorrosive paint is prepared from a component A and a component B, wherein the component A comprises: the component B comprises an aliphatic amine curing agent; the rust conversion agent is a compound of phosphoric acid and gallic acid modified by esterification of polyalcohol monoether;
the component A comprises the following raw materials in parts by weight: 10-20 parts of rust converting agent, 40-60 parts of film forming emulsion and 1-3 parts of thickening agent, wherein the component B comprises 5-20 parts of aliphatic amine curing agent;
the rust conversion agent is a compound of phosphoric acid and gallic acid modified by polyalcohol monoether according to the weight ratio of 1:1-3, wherein the gallic acid modified by polyalcohol monoether esterification is prepared by polyalcohol monoether and gallic acid according to the weight ratio of 0.9-1.2: 1.
2. The anticorrosive paint according to claim 1, wherein the polyhydric alcohol monoether is at least one selected from the group consisting of ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, propylene glycol monophenyl ether, triethylene glycol monomethyl ether, erythritol monomethyl ether, and erythritol monoethyl ether.
3. The anticorrosive coating of claim 1, wherein the film-forming emulsion is made from an epoxy-modified acrylate obtained by polymerization of monomers comprising: bisphenol a epoxy resins, acrylic acid derivatives; 100 parts of bisphenol A epoxy resin and 10-20 parts of acrylic acid derivative.
4. The anticorrosive paint according to claim 3, wherein the bisphenol A epoxy resin has an epoxy value of 0.2 to 0.6mol/100g and is at least one selected from the group consisting of E-20, E-44, E-51, E-54 and E-56 epoxy resins.
5. The anticorrosive paint according to claim 3, wherein the acrylic acid derivative is selected from (meth) acrylic acid, alkyl (meth) acrylate, and (meth) acrylamide.
6. The anticorrosive paint according to any one of claims 1 to 5, wherein the film-forming emulsion is prepared by a method comprising the steps of:
1) dissolving bisphenol A epoxy resin in an organic solvent, introducing inert gas, adding an initiator accounting for 0.1-1% of the mass of monomers contained in the modified acrylate, heating to 80-110 ℃, and keeping the constant temperature;
2) gradually dripping acrylic acid derivatives into the mixed system, and reacting at constant temperature;
3) cooling the final mixed system in the step 2), adding a pH regulator to regulate the pH to be neutral, adding deionized water, and stirring uniformly to obtain the film-forming emulsion.
7. A method for preparing the aqueous two-component conversion-type rust inhibitive coating according to any one of claims 1 to 5, comprising the steps of:
t1: heating phosphoric acid;
t2: adding the gallic acid modified by the polyalcohol monoether into the mixture obtained in the step, and stirring until the gallic acid is completely dissolved;
t3: adding the film-forming emulsion into the mixture obtained in the step under the stirring condition;
t4: adding a thickening agent into the mixture obtained in the step, adjusting the viscosity to obtain an anticorrosive paint component A, discharging and storing;
t5: weighing aliphatic amine curing agent in another container to obtain component B of the anticorrosive paint, discharging and storing;
t6: and (3) uniformly mixing the component A and the component B of the anticorrosive paint obtained in the step for later use.
8. The method of claim 7, wherein the heating temperature in step T1 is 30-40 ℃; and/or the component A has the viscosity of 400-500mpa.s and the solid content of 40-55 percent in the step T4; and/or the component A and the component B are uniformly mixed according to the weight ratio of 0.8-1.2:1 in the step T6.
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CN109295444A (en) * 2018-09-26 2019-02-01 五邑大学 A kind of converting agent of iron rust and its preparation method and application

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新型水性锈转化剂及锈转化涂料的制备及应用;李建峰;《中国优秀硕士学位论文全文数据库 工程科技I辑》;20200315;B018-13 *

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